In a ¢eld experiment, the accumulation of trematode (Echinostomatidae) metacercariae by the New Zealand cockle Austrovenus stutchburyi was compared among treatments with di¡erent seabed hydrodynamics and sedimentation rates. There was no signi¢cant di¡erence among the treatments in the rate at which cockles accumulated metacercariae, suggesting that infection rates are not in£uenced by water £o...

In vivo and ectopic encystment of the cercariae of Echinostoma revolutum from Lymnaea elodes snails in Indiana and chemical excystation of the metacercariae were studied. In vivo encystment occurred in adults of Biomphalaria glabrata and Helisoma trivolvis (Colorado strain) snails and in neonatal and juvenile L. elodes snails. These results were expected because 37-collar-spined Echinostoma spe...

The impact of two principal parasitic digenetic trematodes, Meiogymnophallus minutus and Himasthla spp., on the growth (weight and length) of the cockle, Cerastoderma edule, in Arcachon Bay (France) was studied. The experiment was conducted in the land-based mesocosms. The velocity of infestation with both trematodes was far more rapid during summer in the cockles already parasitized with these...

The author performed a retrospective study on 5 complete reports with geographical data and the prevalence of metacercariae in Thailand. The relation between rainfall (derived from the geographical data) and the prevalence of metacercariae in freshwater fish (derived from the overall infection rate of metacercaria) was investigated. The least- square equation plot rainfall (y) versus prevalence...

To clarify the role of the nutria Myocastor coypus in the epidemiology of domestic fasciolosis in Loire-Atlantique (department of western France), 438 nutrias were trapped in 9 humid areas of the department and 304 nutrias were trapped in 3 farms where Fasciola hepatica was present; all animals were necropsied. Liver flukes were found in 160 nutrias: 38 nutrias randomly taken in the department ...

This study was conducted to investigate the life history, morphology, and maturation of larval stages and adult worms of Fasciola gigantica in experimental mice. Lymnaea auricularia rubiginosa was used as the intermediate host, and Oryza sativa was used for encystment of the metacercariae, while Mus musculus was used as the definitive host for maturation study. Fresh eggs from the gall bladder ...

During the period from October to December 2001, Bucephalus polymorphus metacercariae were described in a new host, Knipowitshia caucasica from Lake Egirdir. A total of 614 fish were collected and the intensity of invasion varied from 10 to 120 parasites per fish. Prevalence of metacercariae of B.polymorphus was 100%, and encysted metacercariae of B.polymorhus were observed in the muscle of the...

Abstract The change in the distribution of organisms freshwater ecosystems due to natural or manmade processes raises question impact alien species on local communities. Although most studies indicate a negative effect, positive one is more difficult discern, especially multispecies systems, including hosts and parasites. purpose study was check whether presence an host, Potamopyrgus antipodaru...